128494812069 has 48 divisors (see below), whose sum is σ = 215108200944. Its totient is φ = 73202227200.

The previous prime is 128494812059. The next prime is 128494812079. The reversal of 128494812069 is 960218494821.

It is a happy number.

128494812069 is a `hidden beast` number, since 1 + 2 + 84 + 9 + 481 + 20 + 69 = 666.

It is an interprime number because it is at equal distance from previous prime (128494812059) and next prime (128494812079).

It can be written as a sum of positive squares in 8 ways, for example, as 6878711844 + 121616100225 = 82938^2 + 348735^2 .

It is not a de Polignac number, because 128494812069 - 2¹⁹ = 128494287781 is a prime.

It is a super-2 number, since 2×128494812069² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128494812029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 408202 + ... + 650859.

It is an arithmetic number, because the mean of its divisors is an integer number (4481420853).

Almost surely, 2^128494812069 is an apocalyptic number.

It is an amenable number.

128494812069 is a deficient number, since it is larger than the sum of its proper divisors (86613388875).

128494812069 is a wasteful number, since it uses less digits than its factorization.

128494812069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059158 (or 1059155 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The spelling of 128494812069 in words is "one hundred twenty-eight billion, four hundred ninety-four million, eight hundred twelve thousand, sixty-nine".